This chapter presents important ethical principles, codes of conduct, and cardinal virtues gleaned from history that may assist emergency managers and disaster response personnel who are confronted by ethical dilemmas encountered in disaster preparedness and response. One of the most common and arguably the most popular bioethical theories in developed western democratic societies is the application of ethical principles or Principlism. Under the influence of this theory, three bioethical principles have dominated clinical decision making within the confines of the doctor-patient relationship. Asserting virtue as an essential element to the practice of disaster medicine requires accepting as a starting premise that there is an ideal toward which emergency and disaster healthcare professionals should strive. Future empiric research in the field should help discern the feasibility of screening for, selecting, teaching, and modeling the cardinal virtues among provider candidates in advance of a disaster or multiple casualty incidents.